package com.imooc.service.impl;

import com.imooc.Enum.OrderStatusEnum;
import com.imooc.Enum.PayStatusEnum;
import com.imooc.Enum.ResultEnum;
import com.imooc.converter.OrderMaster2OrderDTOConverter;
import com.imooc.dataobject.OrderDetail;
import com.imooc.dataobject.OrderMaster;
import com.imooc.dataobject.ProductInfo;
import com.imooc.dto.CartDTO;
import com.imooc.dto.OrderDTO;
import com.imooc.exception.SellException;
import com.imooc.mapper.OrderDetailRepository;
import com.imooc.mapper.OrderMasterRepository;
import com.imooc.service.OrderService;
import com.imooc.service.ProductService;
import com.imooc.util.KeyUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.annotation.Transient;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * Created by ZhangHao
 * 2018-04-12  15:30
 */
@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Autowired
    private ProductService productService;

    @Autowired
    private OrderDetailRepository orderDetailRepository;

    @Autowired
    private OrderMasterRepository orderMasterRepository;

    @Override
    @Transactional
    public OrderDTO create(OrderDTO orderDTO) {
        String orderId = KeyUtil.genUniqueKey();
        BigDecimal orderAmount = new BigDecimal(0);
        //List<CartDTO> cartDTOList = new ArrayList<>();
        //1.查询商品(数量,价格)
        for (OrderDetail orderDetail : orderDTO.getOrderDetailList()) {
            ProductInfo productInfo = productService.findOne(orderDetail.getProductId());
            if (productInfo == null) {
                throw new SellException(ResultEnum.PRODUCT_NOT_EXIST);
            }
            //2.计算总价
            orderAmount = productInfo.getProductPrice()
                    .multiply(new BigDecimal(orderDetail.getProductQuantity()))
                    .add(orderAmount);
            //订单详情入库
            orderDetail.setDetailId(KeyUtil.genUniqueKey());
            orderDetail.setOrderId(orderId);
            BeanUtils.copyProperties(productInfo, orderDetail);
            orderDetailRepository.save(orderDetail);

        }
        //3.写入订单输入库(orderMaster和orderDetail)
        OrderMaster orderMaster = new OrderMaster();
        orderDTO.setOrderId(orderId);
        BeanUtils.copyProperties(orderDTO, orderMaster);
        orderMaster.setOrderAmount(orderAmount);
        orderMaster.setOrderStatus(OrderStatusEnum.NEW.getCode());
        orderMaster.setPayStatus(PayStatusEnum.WAIT.getCode());
        orderMasterRepository.save(orderMaster);

        //4.扣库存
        List<CartDTO> cartDTOList = orderDTO.getOrderDetailList().stream().map(e ->
                new CartDTO(e.getProductId(), e.getProductQuantity())
        ).collect(Collectors.toList());
        productService.decreaseStock(cartDTOList);
//            CartDTO cartDTO = new CartDTO(orderDetail.getProductId(),orderDetail.getProductQuantity());
//            cartDTOList.add(cartDTO);
        return orderDTO;

    }
    @Override
    public OrderDTO findOne(String orderId) {
        OrderMaster orderMaster = orderMasterRepository.findOne(orderId);
        if(orderMaster == null){
            throw new SellException(ResultEnum.ORDER_NOTE_EXIST);
        }

        List<OrderDetail> orderDetailList = orderDetailRepository.findByOrderId(orderId);
        if(orderDetailList==null){
            throw new SellException(ResultEnum.ORDERDetail_NOTE_EXIST);
        }
        OrderDTO orderDTO = new OrderDTO();
        BeanUtils.copyProperties(orderMaster,orderDTO);
        orderDTO.setOrderDetailList(orderDetailList);
        return orderDTO;
    }

    @Override
    public Page<OrderDTO> findList(String buyerOpenid, Pageable pageable) {
        Page<OrderMaster> orderMasterPage = orderMasterRepository.findByBuyerOpenid(buyerOpenid, pageable);

        List<OrderDTO> orderDTOList = OrderMaster2OrderDTOConverter.convert(orderMasterPage.getContent());

        return new PageImpl<OrderDTO>(orderDTOList,pageable,orderMasterPage.getTotalElements());
    }

    @Override
    @Transactional
    public OrderDTO cancel(OrderDTO orderDTO) {
        OrderMaster orderMaster = new OrderMaster();

        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())){
            log.error("[取消订单]订单状态不正确,orderId={},orderStatus={}",orderDTO.getOrderId(),orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);

        }
        //修改订单状态
        orderDTO.setOrderStatus(OrderStatusEnum.CANCEL.getCode());
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult = orderMasterRepository.save(orderMaster);
        if(updateResult ==null){
            log.error("[取消订单]更新失败,orderMaster={}",orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }
        //返还库存
        if(CollectionUtils.isEmpty(orderDTO.getOrderDetailList())){
            log.error("[取消订单]订单中无商品详情,orderDTO={}",orderDTO);
            throw new SellException(ResultEnum.ORDER_DETAIL_EMPTY);
        }
        List<CartDTO> cartDTOList = orderDTO.getOrderDetailList().stream()
                .map(e -> new CartDTO(e.getProductId(),e.getProductQuantity()))
                .collect(Collectors.toList());
        productService.increaseStock(cartDTOList);
        //如果已支付,需要退款
        if(orderDTO.getPayStatus().equals(PayStatusEnum.SUCCESS.getCode())){
            //TODO
        }
        return orderDTO;
    }

    @Override
    public OrderDTO finish(OrderDTO orderDTO) {
        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())){
            log.error("[完结订单]订单状态不正确,orderId={},orderStatus={}",orderDTO.getOrderId(),orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }
        //修改订单状态
        orderDTO.setOrderStatus(OrderStatusEnum.FINISHED.getCode());
        OrderMaster orderMaster = new OrderMaster();
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult = orderMasterRepository.save(orderMaster);
        if(updateResult ==null){
            log.error("[完结订单]更新失败,orderMaster={}",orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        return orderDTO;
    }

    @Override
    @Transactional
    public OrderDTO paid(OrderDTO orderDTO) {
        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())){
            log.error("[订单支付完成]订单状态不正确,orderId={},orderStatus={}",orderDTO.getOrderId(),orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }
        //判断支付状态
        if(!orderDTO.getPayStatus().equals(PayStatusEnum.WAIT.getCode())){
            log.error("[订单支付完成]订单支付状态不正确,orderDTO={}",orderDTO);
            throw  new SellException(ResultEnum.ORDER_PAY_STATUS_ERROR);
        }
        //修改订单状态
        orderDTO.setPayStatus(PayStatusEnum.SUCCESS.getCode());
        OrderMaster orderMaster = new OrderMaster();
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult = orderMasterRepository.save(orderMaster);
        if(updateResult ==null){
            log.error("[订单支付完成]更新失败,orderMaster={}",orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }
        return orderDTO;
    }
}
